Welcome
1. Tow hook is a personal preference. Some people just like the look of an aftermarket tow hook. The car comes with one stock in the trunk. I don't see a reason to have one installed except on the track.
2. Get a Gentex mirror that has LCD screen built into it and get a reasonably priced camera (don't go too cheap). It's very easy to wire it up yourself, or you can pay someone else to do it.
3. Craftsquare mirrors are awesome. But kind of expensive. Just learn the car and pay attention to the cars around you when driving. Back out of parking spaces slowly until you get a clear view.
4. If you had the engine running while the A/C was blowing for 20 minutes, then that wouldn't affect the battery at all. If the engine wasn't running, then neither was the A/C (just the fan). Get a battery test at virtually any local auto parts store for free.
5. As the other member posted, check to see that you still have the OEM catalytic converters installed. Hi-flow cats (HFCs) or test pipes (TPs) will have much more of a fuel smell. That being said, my Fast Intentions exhaust smells a lot more than the OEM exhaust ever did. Frankly, I find it intoxicating.